Java (OpenJDK 8), 200 190 170 bytes
n->{for(char i=0,s[];i<n;s[-~n-i]=47,s[2+n+i]=92,s[0]=i<1|i>n-2?40:'|',s[3+n+n]=i<1|i++>n-2?41:'|',System.out.println("".valueOf(s).replace('\0',' ')))s=new char[4+n+n];}
Java (OpenJDK 8),
Roberto Graham
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